Can't get my sprite moving.

[Insectoid]

is this going to be an ascii map?

[Razgriz]

What do you mean?

The example of my collision map is on page 1.

[Razgriz]

Is anybody up to helping?
I've been trying to figure it out on my own but it's been... ... Less than successful.

[DemonWasp]

We need a bit more information about what you want your program to do; specifically, how does your character move?

If you want your character to move on a grid (he is in one square at a time and one square only) then you probably want to store his position (and the position of obstacles in the grid) as coordinates for your grid. Think of a grid like in Battleship, with letters on one axis and numbers on another (A9, B3, etc) except that instead of using letters, you'll need to use numbers in Turing.

If you want free movement (character isn't on a grid, which is more like real life) then that will be more complex, and you won't be able to use your ASCII map for detecting collisions very easily (it could be done, but it'd be pretty ugly).

[Razgriz]

In such a case, then, I would prefer the grid-type.

So, looking at the map that I drew on paint, How would I go about making the collisions?

For example, so the character doesn't go out-of-map, or through the rock, or over the water.

[DemonWasp]

If you're going for grid-based movement, you want something like this:

1. The location of each player, NPC and other creature in the game is given by their x and y coordinates, which refer to the column they're in. You probably want most characters to move by 1 grid unit at a time.

2. Each grid element has a different character for what it contains. You could use spaces for "passable space" and 'X' for impassable areas (map boundary, rocks, water, etc).

3. Every time a player (or other character) moves, check the grid square they want to move into - if it's a space (passable) then they can move through; if not then they stay where they are.

It looks a little like this:

code:

var playerX, playerY : int % These refer to the position IN THE GRID, not in pixels. const GRID_SIZE : int := 15 % The number of pixels in each grid square. This is necessary for drawing players at the correct position on the map. % Figure out the player's location somehow... % Now let's make a structure to store our map (just a two-dimensional array of characters) const MAP_PASSABLE : char := ' ' const MAP_IMPASSABLE : char := 'X' var mapCols, mapRows : int % The size of the map var map : array 1..mapCols, 1..mapRows of char % Load the map from a file (see file below) var stream : int open, stream, "mymap", get get : stream, mapCols get : stream, mapRows for r : 1..mapRows     for c : 1..mapCols         get : stream, map ( c, r )     end for end for % Main game loop loop     % Get input here and determine what to do with it. This probably includes having variables "playerDestinationX", "playerDestinationY" which give the direction the player is headed in. Don't just move the player, as you still need to check against your grid (that's next).     % Check whether the player can move to their destination     if map ( playerDestinationX, playerDestinationY ) = MAP_PASSABLE then         % If they can, then move them there.         playerX := playerDestinationX         playerY := playerDestinationY     else         put "Can't move there!" % Or some more appropriate error message...     end if     % Draw stuff here as you've been doing. Don't forget to convert from grid-coordinates to pixel-coordinates (hint: this involves multiplying by the size of each grid unit - GRID_SIZE) end loop

Now you need an input file that contains your map. This file is pretty simple; it just contains the number of rows in the map and the number of columns, then the map itself (X and space - I'm sure you can use find-and-replace to convert your existing map, or you can use your map and just change MAP_IMPASSABLE and MAP_PASSABLE above).

code:

10 5 XXXXXXXXXX X  XX    X X  XX    X X      XXX XXXXXXXXXX

Edit: wooo 666 bits

[Razgriz]

Awesome, thanks.

I'll try this as soon as I'm able.

[Razgriz]

So okay,

'10
5 '

Presumably, the 10 and 5 are the length and width, right?

X's are where the character cannot go, and the blanks are where I can.

[DemonWasp]

You need to know the length and the width (columns and rows) of the map. Technically you can get the size of the map other ways, but the easiest way is to just have the map-maker put it right in the file.

Essentially, you're correct.

[Razgriz]

So, logically, since I don't know the grid-dimentions on paint, how would I go about fitting it properly?

Like, the picture is 800x800 pixels, but theres not that many characters across.

Is there a different way of doing this?

[DemonWasp]

You have to decide how many pixels you want per grid square (see the GRID_SIZE constant). Your map-image's size will then have to be determined as follows:

The image will be (number of map columns) * GRID_SIZE pixels wide.
The image will be (number of map rows) * GRID_SIZE pixels tall.

[Razgriz]

Ahh. Okay, awesome stuff.

Thanks for all the help. I'm going to add your MSN, it's probably faster than this, and I'm not on this as much.

[Razgriz]

Oh, and, One more problem . . .

Turing:

const SPEED :int:= 5     var pic : int := Pic.FileNew ("ksprite.gif")     var bg :int:=Pic.FileNew ("bg2.gif")     var bgHeight2 :=Pic.Height (bg)     var picWidth2 :=Pic.Width (pic)     var picHeight2 :=Pic.Height (pic)     var bgWidth2 := Pic.Width (bg)     var bgX := (bgWidth2 - maxx) div 2     var bgY := (bgHeight2 - maxy) div 2     var x2 :int     var y2:int     x2 := (bgWidth - picWidth) div 2    y2 :=(bgHeight - picHeight) div 2 % Omitted     Pic.Draw (bg, -bgX, -bgY, picCopy)     Pic.Draw (pic, x2 - bgX, y2 - bgY, picMerge)     View.Update     cls end loop

Not sure exactly why, but my character spawns off-map in the bottom corner, and I have to press the down and left arrow keys before I can see her.

How would I go about fixing this?


Mod Edit: No spaces in the syntax tags

code:

[syntax="turing"]Code Here[/syntax]

[Razgriz]

Eh, what if my map is now 5000 x 5000 pixels?XD;;

Would that change a great deal?

[DemonWasp]

After an MSN session with Razgriz, the attached code and map emerged.